<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var sum =0;
        var num = prompt("请输入学生人数");
        for(var i=1;i<=num;i++){
            var score = prompt("请输入学生"+i+"成绩");
            sum= sum +parseFloat(score);
        }
            
            alert("学生总成绩为"+sum);
    </script>
</body>
</html>